Cutting-tool for boring or drilling machines.



J. F. CAMPBELL.

CUTTING TOOL FOR BORING 0B. DRILLING MAGHINES.

APPLIOATION FILED 00186, 1908. v

Patented Apr. 13, 1909.

11 TTORNEY.

an a

JOSEPH.

GUTIING-TOOL FDR BORING OR DRILLING MACHINES.

Specification of Letters Patent.

Patented April 13, 1909.

Application filed October 26, 1908. Serial No. 469,511.

A drilling press for providing by cutting away of metal an opening in a piece or block of metal by ripping or shredding such metal by the tool in the formation of the opening therein; and in such connection, my said in vention relates more particularly to the constructive arrangement thereof for the defined purposes.

The nature, characteristic features and scope of my present invention will be more fully understood from the following description taken in connection with the accompanyingdrawings forming part hereof, in which.

Figure 1, is a side elevational view of a ripping, cutting or shredding tool, for employmeat in a boring machine or drilling press embodying the main features of my said invention, showing the removable cutting or shredding blades, and'removable bushing at the end. Fig. 2, is a side elevational view of the tool, at a right angle to Fig. 1. Fig. 3, is a front end elevational view. Fig. 4, is a transverse sectional view of the tool, on the line 0:, an, of Fig. 1. 5., is a longitudinal sectional view through the threaded shank of the tool for detachably securing the end bushing thereto, showing the manner of arranging the parts on the tool or shank; and

Fig. 6, is a perspective view of the bushing detached, showing one edge recessed or offset on both sides thereof.

Re erring to the drawings 4, is a tool sin-- bodying in its structural arrangement the particular features of my said invention, comprising preferably a hardened steel stock 5, with atliick flat body 6, cut away ate, a, on both sides, respectively, and ha 'ing integrally formed therewith tongues 7, 7, and a front end smooth surface shank 9, internally bored out with the wall threaded at 10,

to. receive a corresponding threaded and headed bolt 11, for holding a bushing 12, m

required operative position, by friction, andby means of the head of the bolt? 11, on the shank 9, as clearly shown in F ig. 5. 1n the cutaway surfaces on both sides of the stockbody 6, are provided threaded openings, for the insertion of a series of screws 15.

13 and 13, are two beveled edge ripping, cutting or shredding blades, having on the underside of both longitudinal grooves 14, 14, arranged to mesh with the'tongues 7 and 7 of the stock-body 6. The arrangement of the shank 9, of the tool 4, is such, as that by removing the bolt 11, the bushing '12, can be readily removed and either a thicker or thinner bushing substituted. The bushing 12, in one edge is recessed or offset at 5c, :0 on both sides so that in position the bushing not only snugly fits against the ends of the blades 13- and 13-", but also prevent possible movement or turning of the said blades from the ends thereof, in position on the stock-body 6, during operation of the tool.

The pitch 1 of the working edges of the blades 13 and 13, in position in connection with the stock-body 6, for the ripping or shredding operations upon the iece or block of metal to be acted upon is suc 1, as to avoid, as far as possible, in the actions, revolving at a comparatively high speed, the rapid Wear of the same. Both of the blades 13 and 13*, in one portion may be offset at 17 and 17*, to engage the bushing 12, to aid in firmly holding the bushing 12, on the shank 9 of the tool.

Having thus described the nature and object of my invention, What I claim as new and desire to secure by Letters Patent is 1. A tool of the character described, comprising a stock provided with a body having a tongue and end shank, a bushing mounted on the stock-shank and having one edge recessed, blades having grooves to engage the tongues of said stock and recesses of said bushing and means to detachably secure said blades to said stock, substantially as and for the purposes described.

2. A tool of the character described,.comprising a stock. having offsets and tongues and a shank, a bushing adapted tobe removably supported on said shank and one edge In Witness whereof, have hereunto so;

recessethon borhfsides, blades having respec- ,my signature in the presence of two sub-=' tively, beveled edges, irregular bodies and scribing Witnesses. underneath grooves adapted to engage the v JOSEPH F. CAllPBELL. tongues of said stock and means to remov- Witnesses:

ably hold said blades to said stock, substan J. WALTER DOUGLAES,

tielly'as land for the purposes described. THOMAS M. SMITH. 

